add flatbuffers support and initial rewrite

Signed-off-by: Folling <mail@folling.io>

include/ikarus/models/CMakeLists.txt

@@ -0,0 +1,41 @@
+file(
+    GLOB_RECURSE
+    FLATBUFFER_SOURCES
+    "*.fbs"
+)
+
+foreach (FLATBUFFER_SOURCE IN LISTS ${FLATBUFFER_SOURCES})
+    cmake_path(
+        GET
+        ${FLATBUFFER_SOURCE}
+        FILENAME
+        FLATBUFFER_SOURCE_NAME
+    )
+
+    string(
+        CONCAT
+        FLATBUFFER_GENERATED_SOURCE_NAME
+        ${FLATBUFFER_SOURCE_NAME}
+        "_generated"
+    )
+
+    cmake_path(
+        REPLACE_EXTENSION
+        ${FLATBUFFER_GENERATED_SOURCE_NAME}
+        ".h"
+        OUTPUT_VARIABLE
+        FLATBUFFER_GENERATED_HEADER
+    )
+
+    list(APPEND FLATBUFFER_GENERATED_HEADERS ${FLATBUFFER_GENERATED_HEADER})
+endforeach ()
+
+add_custom_target(
+    flatbuffer_headers
+    COMMENT "Generating flatbuffer headers"
+    DEPENDS ${FLATBUFFER_SOURCES}
+    BYPRODUCTS ${FLATBUFFER_GENERATED_HEADERS}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    COMMAND flatc --cpp --cpp-std "c++17" ${FLATBUFFER_SOURCES}
+    VERBATIM
+)